vt_ioctl: change VT_RESIZEX ioctl to check for error return from vc_resize()
authorGeorge Kennedy <george.kennedy@oracle.com>
Fri, 31 Jul 2020 16:33:12 +0000 (12:33 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 3 Sep 2020 09:21:21 +0000 (11:21 +0200)
commit4e513a6fe26622006eb05a964b61303d03bcf946
tree28c5bea45f95f10de839886016965edce0b3cf95
parent830e87324d3530d017222ceae643dad6beac6650
vt_ioctl: change VT_RESIZEX ioctl to check for error return from vc_resize()

commit bc5269ca765057a1b762e79a1cfd267cd7bf1c46 upstream.

vc_resize() can return with an error after failure. Change VT_RESIZEX ioctl
to save struct vc_data values that are modified and restore the original
values in case of error.

Signed-off-by: George Kennedy <george.kennedy@oracle.com>
Cc: stable <stable@vger.kernel.org>
Reported-by: syzbot+38a3699c7eaf165b97a6@syzkaller.appspotmail.com
Link: https://lore.kernel.org/r/1596213192-6635-2-git-send-email-george.kennedy@oracle.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/tty/vt/vt_ioctl.c